Matt McGloin is expected to assume back-up quarterback duties with Christian Ponder's departure.
In four preseason games for the Raiders, Ponder completed 22 of 35 passes for one touchdown and one interception.
Ponder spent the first four years of his career with the Minnesota Vikings, who drafted him No. 12 in 2011. Last season, Ponder appeared in two games for the Vikings after having started nine games for the team in 2013.
In his only full NFL season in 2012, Ponder threw for 2,935 yards, 18 touchdowns and 12 interceptions while completing 62.1% of his passes.
- Christopher Chavez